ShadowImage specifications

RAID level

All supported RAID levels are supported.

Pair volumes

• Number of P-VOLs per S-VOL: 1
• Number of S-VOLs per P-VOL:

  L1 pairs: maximum of 3

  L2 pairs: maximum of 2

• Maximum size of a P-VOL: maximum volume size in the storage system
• Maximum size of an S-VOL: maximum volume size in the storage system.
• Maximum size of all P-VOLs and S-VOLs: maximum size of all volumes that can be created in a storage system
• Supported volume types:
  • Internal volumes
  • External volumes
  • Variable volume created by using Virtual LVI (CV). (The pair volumes must have the same capacity and emulation type.)
• Mirror Unit (MU) number: 0, 1, or 2 (The MU number is used for CCI operations.)
  • L1 pairs: 0, 1, or 2
  • L2 pairs: 1 or 2
• Sharing pair volumes with other software applications: supported

  For details, see Sharing ShadowImage volumes with other software applications.

Maximum number of pairs

In the following formulas, "floor" means you need to round down the result of the calculation enclosed in the outer parentheses () to the nearest integer.

DP-VOLs only:

• VSP One B24: floor((16,384 - number-of-pool-volumes) / 2)
• VSP One B26: floor((32,768 - number-of-pool-volumes) / 2)
• VSP One B28: floor((49,152 - number-of-pool-volumes) / 2)
• VSP One B85: 31,616

DRS-VOLs with compression only:

• VSP One B24: floor((16,384 - number-of-pool-volumes) / 2)
• VSP One B26: floor((21,760 - number-of-pool-volumes) / 2)
• VSP One B28: floor((21,760 - number-of-pool-volumes) / 2)
• VSP One B85: 10,879

DRS-VOLs with compression and deduplication:

• VSP One B24: floor((16,376 - number-of-pool-volumes) / 2)
• VSP One B26: floor((21,754 - number-of-pool-volumes) / 2)
• VSP One B28: floor((21,754 - number-of-pool-volumes) / 2)
• VSP One B85: 10,859

DRD-VOLs with compression only:

• VSP One B24: floor((16,384 - number-of-pool-volumes) / 2)
• VSP One B26: floor((32,640 - number-of-pool-volumes) / 2)
• VSP One B28: floor((32,640 - number-of-pool-volumes) / 2)

DRD-VOLs with compression and deduplication:

• VSP One B24: floor((16,376 - number-of-pool-volumes) / 2)
• VSP One B26: floor((32,630 - number-of-pool-volumes) / 2)
• VSP One B28: floor((32,630 - number-of-pool-volumes) / 2)

External volumes:

• VSP One B24: 8,192
• VSP One B26: 16,384
• VSP One B28: 24,576
• VSP One B85: 31,616

Consistency groups

• Maximum number of consistency groups per storage system: 2,048 (including SI and TIA)
• Maximum number of consistency groups for SI: 128

  Note: You cannot place SI and TIA pairs in the same consistency group.

• Maximum SI pairs per consistency group: 8,192
• CTG IDs: 000 to 7FF

  CTG IDs 000 to 07F (0 to 127) are used for SI and TIA.

  CTG IDs 080 to 7FF (128 to 2,047) are used only for Thin Image Advanced.